With the Fastar option on all EdgeHD optical systems, coupled with
the .7x reducer, your telescope becomes the most complete imaging
system available in its price range today.

Performance

Design: 4-element optical layout designed
specifically for the EdgeHD 8" to maintain the flat-field performance of
the Edge HD optical design

105mm of back focus: Provides generous back focus
to accommodate additional accessories and a wide variety of cameras.
Also allows use of existing T-adapters for EdgeHD 800 and other
Celestron imaging accessories

One full F-Stop faster than f/10: Reduces the exposure time by one-half to capture the same brightness of object

Increase field of view by 43%: Better for capturing wide field images of larger galaxies and nebulae